diff --git a/src/ior.c b/src/ior.c
index 3ef411c..1ebcda8 100755
--- a/src/ior.c
+++ b/src/ior.c
@@ -1580,6 +1580,7 @@ static void ValidateTests(IOR_param_t * test)
             && (strcasecmp(test->api, "MPIIO") != 0)
             && (strcasecmp(test->api, "MMAP") != 0)
             && (strcasecmp(test->api, "HDFS") != 0)
+            && (strcasecmp(test->api, "Gfarm") != 0)
             && (strcasecmp(test->api, "RADOS") != 0)) && test->fsync)
                 WARN_RESET("fsync() not supported in selected backend",
                            test, &defaults, fsync);